#1
Which vein is commonly used for routine venipuncture?
Median cubital vein
ExplanationCommonly accessed due to its stability and visibility.
#2
What is the primary purpose of using a butterfly needle during blood collection?
To facilitate blood flow for fragile veins
ExplanationMinimizes trauma to delicate veins.
#3
What is the purpose of a syringe method in blood collection?
To minimize the risk of hematoma
ExplanationReduces the chance of blood leakage and tissue damage.
#4
Which technique is commonly used for capillary blood collection?
Fingerstick
ExplanationNon-invasive method commonly used for small blood volumes.
#5
What is the primary purpose of warming the site before capillary blood collection?
To improve blood flow and ease the collection
ExplanationEnhances blood flow for a more efficient and less painful capillary collection.
#6
What is the purpose of using a tourniquet during blood collection?
To dilate blood vessels
ExplanationIncreases vein visibility and facilitates blood draw.
#7
Which antiseptic is commonly used for cleaning the site before venipuncture?
Povidone-iodine
ExplanationEffective against a broad range of microorganisms.
#8
Which factor is crucial for successful blood culture collection?
Collecting blood in a sterile tube
ExplanationPrevents contamination and ensures accurate culture results.
#9
In what order should blood collection tubes be filled when using the same venipuncture site?
Blue, Red, Green, Lavender
ExplanationPreserves sample integrity by minimizing cross-contamination.
#10
Which factor is essential to consider when selecting the appropriate needle gauge for venipuncture?
Vein depth and size
ExplanationEnsures optimal puncture without causing unnecessary trauma to the vein.
#11
What is the recommended time limit for a tourniquet to be applied during venipuncture?
30 seconds
ExplanationBalances vein engorgement with minimizing patient discomfort.
#12
What is the primary reason for using a discard tube before collecting blood for laboratory testing?
To prime the needle
ExplanationClears the blood path of air, ensuring accurate sample volumes.
#13
What is the recommended angle for inserting the needle during venipuncture?
45 degrees
ExplanationOptimal for successful vein puncture.
#14
Which blood collection tube is typically used for coagulation studies?
Blue top tube
ExplanationContains sodium citrate as an anticoagulant for coagulation tests.
#15
What is the purpose of gently inverting blood collection tubes after collection?
To mix anticoagulant with blood
ExplanationEnsures uniform distribution of anticoagulant for accurate results.
#16
Which vein is often used for venipuncture in pediatric patients?
Cephalic vein
ExplanationCommon choice in pediatric patients for accessibility and minimal discomfort.
#17
Which blood collection tube is commonly used for glucose testing?
Gray top tube
ExplanationContains sodium fluoride as an anticoagulant to preserve glucose levels.
#18
What precaution should be taken when collecting blood for arterial blood gas (ABG) analysis?
Warm the site before collection
ExplanationEnhances blood flow and ensures accurate ABG results.
#19
What is the primary advantage of using a closed blood collection system?
Reduced risk of contamination
ExplanationMinimizes exposure to external contaminants during sample collection.